Homeostasis When A Student Walks Up The Down Escalator
Cassie Ho
Period 1
Physiology
September 16th 2014
Lab 1: Homeostasis
Background Information
The conditions in our bodies do not really change at all. Our body temperature has to stay within a certain range in order to function. We maintain these function through a process which is called homeostasis. Homeostasis is the process of maintaining a constant internal environment such as body temperature, blood pressure, and heart rate. An analogy to help explain homeostasis is a student walking up the down escalator. When a student walks up the escalator at the same speed as the escalator is descending, the student stays in the same level. This shows how homeostasis maintains a constant temperature. If a student walks up the escalator at a faster …show more content…
rate than the rate at which the escalator descends then the student will move up the escalator, which is similar to overheating while doing work.
When the student becomes too hot, they will become exhausted and will need to rest (which is why going up on the down escalator is such hard work). On the other hand, when the student walks up at a slower rate than the rate at which the escalator descends he or she moves downwards. This is like getting cold because there is no activity or there is too much heat lost to the environment, and so the person slows down or stops moving all together. Negative feedback is a certain mechanism that causes a decrease in function, while positive feedback enhances an original stimulus. One inhibits or stops an action while the other enhances the action. In homeostasis positive and negative feedback loops are used to regulate and maintain a stable internal environment. When the body’s internal checkpoint gets too high or too …show more content…
low the body will respond with an appropriate action to return it back to its original state.
A factor that helps regulate homeostasis is body temperature. Temperature is a measure of the amount of heat and energy in a certain substance or body, and is mainly measured in degrees Celsius or Fahrenheit. The normal temperature in the human body ranges from 97.8F to 99F. When the body temperature exceeds 99F, the sweat glands in the top layer of the skin will open up to produce sweat in order to help the body cool down so that it may return to its original set temperature. However, when the body temperature drops below the normal range, the sweat glands will close to retain body heat. This demonstrates homeostasis because it shows how the body will react to increase or decrease the body’s internal temperature to ensure that it is maintained at a certain range.
Another example of homeostasis is the regulation of blood pressure.
Blood pressure is the measurement of the force that is applied to the walls of the arteries as the heart pumps blood throughout the body. Blood pressure is normally measured with a blood pressure monitor, and is measured as a two number ratio. The top number is the systolic number, it is the higher of the two numbers and it measures the pressure in the arteries when the heart contracts. The number on the bottom of the ratio is the diastolic number, this measures the pressure in the arteries between heartbeats when the heart is resting and refilling with blood. Normal blood pressure is when the systolic number is less than or equal to 120 and the diastolic number is less than or equal to 80. As the numbers increase a person is more likely to be diagnosed with high blood pressure which puts them at a higher risk of having a heart attack or stroke. Blood pressure helps the body maintain homeostasis, without the regulation of blood pressure, the increase pressure of the blood flow could damage the walls of the arteries. When the arteries are damaged, plaque starts to build up causing obstructions in the arteries which can lead to cardiovascular
diseases.
Regulation of heart rate is also an example of homeostasis. Heart rate is the measure of the how many times the heart beats within a certain time period, commonly measured as number of heartbeats per minute. One way to measure heart rate is by placing the index and middle finger on the radial artery in the wrist or on the carotid artery artery in the neck and counting the number of beats in 20 seconds and then multiplying by 3. The standard range of heart rate is different for everyone because a person’s weight, age, and body composition is factored in to help calculate the normal range. The general equation of calculating a person's max heart rate is 220 minus their age. When a person exercises his or her heart rate will gradually increase because the heart is trying to deliver as much oxygen rich blood to the working muscles. This is an example of positive feedback because the more you exercise the more your heart rate increases. On the other hand, the heart rate will decrease when the person stops exercising. This is an example of negative feedback because the body wants to return its heart rate back to its normal resting heart rate. This increase and decrease in heart rate demonstrates homeostasis because it combines both negative and positive feedback.
Running is a exercise that many people do daily. When the test subjects run, their temperature will start to rise as well as their heart rate. To release the extra heat, their body will open its pores on the skin so that they start sweating. The body uses oxygen to make energy, and muscles need energy to relax and contract. As the test subject run, the demand for energy in their muscles increases, and so their lungs work harder to provide the oxygen their muscles are begging for. The result of higher demand for oxygen is faster deeper breaths.When people stop running, the human body returns back to normal because homeostasis regulates heartbeat. Heart rate is maintained by homeostasis.
Materials and Methods
Procedures
1. Gather up 100 Cupertino High School students.
2. Then have each student measure their heart rate by placing two fingers on their carotid artery in the neck under the base of the jaw or on the radial artery in the wrist.
3. Have each student count how many heart beats there are in 20 seconds and multiply the number they get by 3. Record with the record keeper of the final results.
4. Bring all the students to the Cupertino High School football field.
3. Have each student sprint as fast as they can one time across the Cupertino High Schools football field from end zone to end zone.
4. After each student completes the run repeat steps two and three.
5. Record each student's final heart rate with the record keeper.
6. Wait 20 minutes after the run and then repeat steps two and three and record heart rate again and report results to the record keeper.
7. Repeat steps one through five but this time before running make sure everyone consumes a serving of In-N-Out fries.
Period 1
Physiology
September 16th 2014
Lab 1: Homeostasis
Background Information
The conditions in our bodies do not really change at all. Our body temperature has to stay within a certain range in order to function. We maintain these function through a process which is called homeostasis. Homeostasis is the process of maintaining a constant internal environment such as body temperature, blood pressure, and heart rate. An analogy to help explain homeostasis is a student walking up the down escalator. When a student walks up the escalator at the same speed as the escalator is descending, the student stays in the same level. This shows how homeostasis maintains a constant temperature. If a student walks up the escalator at a faster …show more content…
rate than the rate at which the escalator descends then the student will move up the escalator, which is similar to overheating while doing work.
When the student becomes too hot, they will become exhausted and will need to rest (which is why going up on the down escalator is such hard work). On the other hand, when the student walks up at a slower rate than the rate at which the escalator descends he or she moves downwards. This is like getting cold because there is no activity or there is too much heat lost to the environment, and so the person slows down or stops moving all together. Negative feedback is a certain mechanism that causes a decrease in function, while positive feedback enhances an original stimulus. One inhibits or stops an action while the other enhances the action. In homeostasis positive and negative feedback loops are used to regulate and maintain a stable internal environment. When the body’s internal checkpoint gets too high or too …show more content…
low the body will respond with an appropriate action to return it back to its original state.
A factor that helps regulate homeostasis is body temperature. Temperature is a measure of the amount of heat and energy in a certain substance or body, and is mainly measured in degrees Celsius or Fahrenheit. The normal temperature in the human body ranges from 97.8F to 99F. When the body temperature exceeds 99F, the sweat glands in the top layer of the skin will open up to produce sweat in order to help the body cool down so that it may return to its original set temperature. However, when the body temperature drops below the normal range, the sweat glands will close to retain body heat. This demonstrates homeostasis because it shows how the body will react to increase or decrease the body’s internal temperature to ensure that it is maintained at a certain range.
Another example of homeostasis is the regulation of blood pressure.
Blood pressure is the measurement of the force that is applied to the walls of the arteries as the heart pumps blood throughout the body. Blood pressure is normally measured with a blood pressure monitor, and is measured as a two number ratio. The top number is the systolic number, it is the higher of the two numbers and it measures the pressure in the arteries when the heart contracts. The number on the bottom of the ratio is the diastolic number, this measures the pressure in the arteries between heartbeats when the heart is resting and refilling with blood. Normal blood pressure is when the systolic number is less than or equal to 120 and the diastolic number is less than or equal to 80. As the numbers increase a person is more likely to be diagnosed with high blood pressure which puts them at a higher risk of having a heart attack or stroke. Blood pressure helps the body maintain homeostasis, without the regulation of blood pressure, the increase pressure of the blood flow could damage the walls of the arteries. When the arteries are damaged, plaque starts to build up causing obstructions in the arteries which can lead to cardiovascular
diseases.
Regulation of heart rate is also an example of homeostasis. Heart rate is the measure of the how many times the heart beats within a certain time period, commonly measured as number of heartbeats per minute. One way to measure heart rate is by placing the index and middle finger on the radial artery in the wrist or on the carotid artery artery in the neck and counting the number of beats in 20 seconds and then multiplying by 3. The standard range of heart rate is different for everyone because a person’s weight, age, and body composition is factored in to help calculate the normal range. The general equation of calculating a person's max heart rate is 220 minus their age. When a person exercises his or her heart rate will gradually increase because the heart is trying to deliver as much oxygen rich blood to the working muscles. This is an example of positive feedback because the more you exercise the more your heart rate increases. On the other hand, the heart rate will decrease when the person stops exercising. This is an example of negative feedback because the body wants to return its heart rate back to its normal resting heart rate. This increase and decrease in heart rate demonstrates homeostasis because it combines both negative and positive feedback.
Running is a exercise that many people do daily. When the test subjects run, their temperature will start to rise as well as their heart rate. To release the extra heat, their body will open its pores on the skin so that they start sweating. The body uses oxygen to make energy, and muscles need energy to relax and contract. As the test subject run, the demand for energy in their muscles increases, and so their lungs work harder to provide the oxygen their muscles are begging for. The result of higher demand for oxygen is faster deeper breaths.When people stop running, the human body returns back to normal because homeostasis regulates heartbeat. Heart rate is maintained by homeostasis.
Materials and Methods
Procedures
1. Gather up 100 Cupertino High School students.
2. Then have each student measure their heart rate by placing two fingers on their carotid artery in the neck under the base of the jaw or on the radial artery in the wrist.
3. Have each student count how many heart beats there are in 20 seconds and multiply the number they get by 3. Record with the record keeper of the final results.
4. Bring all the students to the Cupertino High School football field.
3. Have each student sprint as fast as they can one time across the Cupertino High Schools football field from end zone to end zone.
4. After each student completes the run repeat steps two and three.
5. Record each student's final heart rate with the record keeper.
6. Wait 20 minutes after the run and then repeat steps two and three and record heart rate again and report results to the record keeper.
7. Repeat steps one through five but this time before running make sure everyone consumes a serving of In-N-Out fries.